I just bought a HG last week. It worked when I picked it up and now that I set it up it won't boot; I don't get any flashes at the MPU. My friend and I tested all of the test points on the power driver board and they all have power. I am not getting 5v at either test points on the solenoid driver board or 5v at the test points on the MPU.

Any ideas on what I should check or test next?

I did a quick continuity check with them installed but can pull them to test better. If all of the rectifier board test points have voltage wouldn't that mean the fuses are good?

doesn't do anything. Since I just got this game I can't say for sure that the LED works. all of the connections are on properly and have been re-seated a couple times.

I just checked the SDB voltages again. For some reason it's blowing fuse 3 and I'm not getting anything at TP3. I'm 99.9% sure we checked this before and we had the correct voltage; I want to say it was 14vdc. J3 on the rectifier board is plugged in. I have 6.4vdc at TP1 on SDB. TP2 was 265, TP3 was .5vdc, I didn't test TP4, TP5 was 47vdc

I just checked the BR1,2, and3 on the PDB using this method I found on pinside and they all tested good: To test use Dmm in diode test. Put your neg blk lead to the pos DC point. Put red pos on either AC lug you should get around .4-.6v. Both AC lugs should read the same never move the black lead for this test. You just tested two diodes in bridge.
Now put red on the neg dc lug and black goes to each AC lead. Same thing as you just did .4-.6 should be read. Now you just tested the other two diodes. In the above info of the four readings nothing should be open. OL (over range) or shorted .1 or beep on metet.

I just checked the 3 bridges as described in my post #8, it may not have been there when you were answering me, but all tested good.

I figured it out last night. I installed a new fuse, unplugged all of the connectors on the MPU board and powered up the game, the fuse didn't blow and I was getting the correct voltage at TP3 on the SDB. I then turned the game off, installed a connector on the MPU board, turned on the game, the fuse didn't blow. I did this until I got down to J4, plugged it in, turned on the game and the fuse below within a few seconds.

I pulled the MPU board. I did some continuity testing on the pins to make sure there wern't any solder bridges. I was getting ground on all 4 of the bottom pins which didn't seem right to how the trace routing looked on the board so I checked these pins on my Eight Ball Deluxe and only the bottom two pins had ground.

As it turns out, we fixed a few things on the MPU board and added a ground mod earlier in the day. The ground mod jumper wire insulation melted ever so slightly during install and was making contact with a leg of a resistor shorting it out causing my problem. I removed the ground mod wire, re-installed the mpu, and it booted right up! Next will be replacing all of the nasty looking pins on the bridge rectifier board.